Rock-drill.



H. J. HIBSGHLE.

ROCK DRILL.

APPLICATION FILED DEG.26,1908.

, 941,251. Patented Nov. 23, 1909.

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UNITED STATES PATENT OFFICE.

HERMAN J. I-IIIBSCHLE, OF VICTOR, COLORADO, ASSIGNOR TO THE MacCORMACK DRILL AND MANUFACTURING COMPANY, OF CRIPPLE CREEK, COLORADO, INCORPORATED.

ROCK-DRILL.

Specification of Letters Patent.

Patented Nov. 23, 1909.

Original application filed. August 10, 1908, Serial No. 447,695. Divided and this application filed. December T 0 all whom it may concern:

Be it known that I, HERMAN J. HIBsoHLn, residing at Victor, in the county of Teller and State of Colorado, have invented certain new and useful Improvements in Rock- Drills, of which the following is a specification.

My invention relates to rock drills, and in its generic nature my present invention seeks to provide an improved construction of drill wherein an improved feed mechanism is provided and an improved means for locking the feeding mechanism at times, and wherein an improved means for shutting off the working agent supply to the drilling agent, when the piston is at the end of its forward stroke, is provided.

This application is a divisional part of my co-pending application filed August 10, 1908, Serial No. 47,695, and in this application I lay no claim per 86 to the engine construction as that forms the subject-matter of my co-pendin application.

More specifically my invention embodies those novel details of construction, combination and arrangement of parts all of which will be first fully described and then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which:

Figure 1, is a perspective view showing the application of my invention. Fig. 2, is an enlarged side elevation of the back head plug. Fig. 3, is a top plan thereof. Fig. 4:, is a cross section on the line 1 1 of Fig. 3. Figs. 5 and 5 are a central longitudinal section of my invention, the feed piston being at the beginning of its feed stroke and the feed casing locked. Fig. 6, is a similar view with the piston at the end of its feeding stroke, the drilling engine being shown in side elevation.

Referring now to the accompanying drawings in which like numerals of reference indicate like parts in all of the figures 1 represents the drilling engine casing whose forward end 1 carries a drill receiving chuck 2 and a striking plug 3 with which the hammer piston 4 operating within the casing 1, impacts.

The rear end of the casing 1 is internally threaded as at 5 to receive the back plug 6 which has its forward end threaded as at 7, to coiiperate with the threads of the casing Serial No. 469,311.

lng agent inlet port of the drilling engine casing to conduct the working agent into the engine.

A series of ports 10 connect the groove 9 with the central internal bore 11 of the head plug 6. The bore 11 runs from the ports 10 rearwardly and is enlarged at its rear end as at 12, and internally threaded to receive the piston rod 13, hereinafter again referred to.

The head plug 6 is provided with a valve aperture to receive the bushing 30 and the valve 31, the valve 31 having apassageway 32 which when turned in one position permits live working agent to pass through the passage 11 of the head plug to the drilling engine and when in another position the valve 31 will cut off the supply of working agent. The valve 31 has a stem 33 which projects through a closure cap 3% having a gland 35, and the stem 33 is provided with a wrench receiving portion 36 to receive a wrench 37 or other convenient means by which the valve 31 may be operated. The back head plug is also provided at its rear end with a pair of lugs 38 at each side, one pair being diametrically opposite the other to receive the pivot pins 39 of the latches d0, the latches 40 having hook portions ll and are spring pressed to their engaging positions by springs 12 held in apertures or sockets 43 of the back head plug 6, as clearly shown in Fig. 5, of the drawings.

The feed piston rod 13 is threaded into the rear end of the back head plug 6, at one end of the rod, as before stated, and at the other end the piston rod 13 carries the piston 47 which is provided with a longitudinal aperture of small diameter 4:8 and a radial aperture 46 merging therewith, the radial aperture being also of small bore for a purpose presently to appear. The piston rod 13 is centrally apertured as at 50 and at its rear end adjacent to the piston at? it is provided with radial ports 51, as shown, the rod 13 being of slightly less diameter than the piston l7 for a purpose presently to appear. The piston casing at its rear end may be provided with a pointed portion 52 to engage an abutment, in feeding the drill forward. At the forward portion of the casing the inlet coupling member 54 is secured and this coupling member is adapted to be connected with the air inlet pipe from the source of working agent supply.

When it is desired to render the feeding mechanism of the drill inoperative the latches 40 are allowed to engage the cap A9 and thus lock the feed piston from operation.

So far as described the manner in which my invention operates will be best explained as follows: Assume that it is desired to feed the engine automatically, the working agent enters through the coupling member 54 into the feed piston casing, passing through the apertures 51 into the interior of the feed piston and then through the aperture L8 into the rear of the piston casing to force the piston, and consequently the drilling engine forward. As soon as the operator opens the valve 81 to permit working agent to flow through the passage 11 of the back head plug 6, the working agent will enterthe inlet port of the drill and operate the same in the usual manner, it being understood that the construction of the drilling engine may be of any approved type, as the same, 2201" 86, forms no part of my present invention, but I prefer to use such a drilling engine as forms the subject-matter of my co pending application hereinbefore referred to.

The action of the hammer piston may be controlled by the valve 31 and as long as the latches 40 do not engage the cap 4,9 the feeding of the drill to the work will be automatic.

As the drill is fed forwardly and as the feed piston reaches the forward limit of its stroke, the air supplied to the engine and to the feed piston casing, for feeding purposes, will be automatically cut off by the feed piston passing over aperture in the coupling member, as shown in Fig. 6, of the drawings.

When it is desired to lock the feeding mechanism from operation the latches 40 are brought into engagement with the cap and the parts thus locked together.

The small bore 46 that comes into alinement with the coupling member when the piston is at the forward limit of its stroke, simply serves to keep up enough air pressure to holdthe drilling engine in position and prevent it from falling when it is used in the manner shown in Fig. 1, of the drawings, since were the air pressure cut entirely off from within the piston casing the tendency of the parts would be to telescope and likely drop and thereby seriously damage the ame.

lVhat I claim is: Y

1. In a rock drill, a piston having a main body portion provided with an internal piston chamber, a reciprocating hammer piston operatable therein, said main body portion having a working agent passage to said piston and an exhaust passage from said piston, said piston casing also including a chuck holding end and a striking plug held in said chuck holding end to receive the impacts of the piston, a back head plug threaded into the main body portion of the casing and having a central passage terminating in a radial port to communicate with the air inlet passage of the main body portion of the casing, a cut-off valve in said central passage of the back head plug, a hollow feed piston rod connected with said back head plug, a feed piston easing into which said feed piston rod projects, said piston rod terminating in a feed piston head, said feed piston rod having radial ports adjacent to said head and in communication with the interior of the rod, means for admitting working agent into the feed piston casing to automatically force the feed piston in one direction to feed the drill forward, said feed piston head having a longitudinal bore of-relatively small diameter, and a radial bore registering there with.

2. In a .rock drill, a piston having a main body portion provided with an internal piston chamber, a reciprocating hammer piston operatable therein, said main body portion having a working agent passage to said piston and an exhaust passage from said piston, said piston casing also including a chuck holding end and a striking plug held in said chuck holding end to receive the impacts of the piston, a back head plug threaded into the main body portion of the casing and having a central passage terminating in a radial port to communicate with the air inlet passage of the main body portion of the casing, a cut-off valve in said central passage of the back head plug, a hollow feed piston rod connected with said back head plug, a feed piston easing into which said feed piston rod projects, said piston rod terminating in a feed piston head, said feed piston rod having radial ports adjacent to said head and in communication with the interior of the rod, means for admitting working agent into the feed piston casing to automatically force the feed piston in one direction to feed the drill forward, said feed piston head having a longitudinal bore of relatively small diameter and a radial bore registering therewith, said means for admitting working agent into the feed piston casing adapted to be closed off by the feed piston when it reaches the limit of its stroke in one direction.

3. In a rock drill, a piston having a main body portion provided with an internal piston chamber, a reciprocating hammer operable therein, said main body portion having a working agent passage to said piston and an exhaust passage from said piston, said piston casing also including a chuck holding end and a striking plug held in said chuck holding end to receive the impacts of the piston, a back head plug threaded into the main body portion of the casing and having a central passage terminating in a radial port to communicate with the air inlet passage of the main body portion of the casing, a cut-off valve in said central passage of the back head plug, a hollow feed piston rod connected with said back head plug, a feed piston casing into which said feed piston rod projects, said piston rod terminating in a feed piston head, said feed piston rod having radial ports adjacent to said head and in communication with the interior of the rod, means for admitting working agent into the feed piston casing to automatically force the feed piston in one direction to feed the drill forward, said feed piston head having a longitudinal bore of relatively small diameter and a radial bore registering there with, means carried by the back plug to cooperatively engage the feed casing to lock the feed piston from operation, said last named means comprising lugs carried by the back head plug, latch members pivoted to said lugs, said feed piston casing having a shoulder to be engaged by said latches at times.

i In a rock drill the combination with the drilling engine having a back head plug through which working agent is supplied to the engine; a hollow feed piston rod connected with the back head plug, a feed piston casing into which said feed piston rod projects, said piston rod terminating in a feed piston head, said feed piston rod having radial ports adjacent to said head and in communication with the interior of the rod, means for admitting working agent into the feed piston casing in front of the head, means for permitting passage of the working agent through the head and to the rear thereof to force the feed piston in one direction to feed the drill forward, said piston head having a radial bore registering with said passage, said working agent admitting means comprising a coupling member se cured to the feed piston casing and having a port in communication therewith, and said feed piston adapted to close said port when in one position.

5. In a rock drill the combination with the drilling engine, of a. hollow feed. piston connected with said drilling engine to pass the working agent there-into, a feed piston casing into which said feed piston rod projects, said piston rod terminating in a feed piston head, said feed piston rod having radial ports adjacent to said head and in communication with the interior of the rod, means for admitting working agent into the feed piston casing to automatically force the feed piston in one direction to feed the drill forward, said feed piston head having a longitudinal bore and a radial bore registering therewith, said means for admitting working agent into the feed piston casing adapted to be closed 05 by the feed piston when it reaches the limit of its stroke in one direction.

HERMAN J. HIBSCHLE.

Vitnesses JOHN U. CLARK, A. D. QUAINTANCE. 

